Doug, I suspect that one or both of the wattmeter diodes in the KAT100 are fried. It would be a good idea to check those in the KPA100 as well. KAT100 D1 and D2 and KPA100 D16 and D17.
73, Don W3FPR Douglas Furton wrote: > Dear Reflector, > > Hello again. I wish I wrote more often to say how good my K2 and KPA100 with > KAT100 are working, but I don't. They have been working great. > > I built a KPA100 and KAT100 into an EC2 enclosure. Everything has worked > well for quite some time now (~1 yr.). > > Today, I write with a problem: I fired up my rig and find that the SWR > indication on the KAT100 is faulty. Here are the symptoms, transmitting into > a dummy load: > > First, something that works properly: when I dial up the output power without > transmitting, the PWR range LED switches from low to high at ~9 watts. > > Then -- with the ATU in CAL mode -- when I hit TUNE with the power set to the > low end of either the low- or high-power ranges none of the SWR LEDs light. > With the K2 still in TUNE mode, as I slowly dial up the power, suddenly all > of the SWR LEDs light. This happens if I start at 1 watt and tune to about 5 > watts; and if I start at 10 watts and dial up to about 50 watts. > > When I hit TUNE at about 1 watt and dial up the power past 9 watts, the SWR > LEDS come on at about 5 watts, then I hear a relay click in the KAT100/KPA100 > indicating it changed power range at about 9 watts, but the PWR range LED > does not flip from low to high and all the SWR LEDs remain lit. > > I also get erratic HiRFL messages on the K2 display, but not reliably when > all the SWR lights come on as I described above. > > The K2/KPA100/KAT100 currents are normal. > > Otherwise, the rig seems to perform as it did before this fault appeared. > Output power is good, and it all seems to transmit into an antenna that I > know is resonant and good on 20 m. > > What should I check out first? > > It might help to know that between the time I noticed this problem and the > last time I used the rig, there was a thunderstorm in my area. While I > normally set my antenna switch to ground the antenna and project my xmitters, > I did not do so this time. My coax is grounded with two levels of lightening > protection at the house: "cheap" lightening-arrester connectors outdoors > followed by an alpha-delta coax switch with the "arc-plug" indoors. The > arc-plug is not "popped", or however you describe it -- it works fine still. > > Perhaps a lightening pulse of some sort caught something in the SWR section > of the KAT100??? > > Thanks to the community for help with this problem. > > Doug > > ____________________________________________________________ > TRY FREE IM TOOLPACK at http://www.imtoolpack.com/default.aspx?rc=if5 > Capture screenshots, upload images, edit and send them to your friends > through IMs, post on Twitter®, Facebook®, MySpace™, LinkedIn® – FAST! > ______________________________________________________________ > Elecraft mailing list > Home: http://mailman.qth.net/mailman/listinfo/elecraft > Help: http://mailman.qth.net/mmfaq.htm > Post: mailto:Elecraft@mailman.qth.net > > This list hosted by: http://www.qsl.net > Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
